CT-161-CD Fujitsu Semiconductor America Inc, CT-161-CD Datasheet - Page 62
CT-161-CD
Manufacturer Part Number
CT-161-CD
Description
KIT 16LX FOR MB90F387
Manufacturer
Fujitsu Semiconductor America Inc
Series
F²MC-16LXr
Type
MCUr
Specifications of CT-161-CD
Contents
Board, Cable, CD
For Use With/related Products
MB90F387S
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
865-1103
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
CT-161-CD
Manufacturer:
Fujitsu Semiconductor America
Quantity:
135
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4.2
A piezoelectric buzzer uses a piezoelectric device as described above. To produce a sound
from the piezoelectric buzzer, you should apply a changing voltage, e.g., AC or pulse voltage,
to the buzzer. Here, let's sound a piezoelectric buzzer by using a pulse wave (pulse voltage)
output from the microcomputer.
4.1.3
When an AC voltage is applied across a piezoelectric crystal, the crystal contracts or
expands alternately each time the direction of current is reversed as shown in Figure 4.3.
The cycle of contraction and expansion changes when the frequency of AC voltage is
varied. This characteristic can be used to vibrate the crystal at various frequencies. If
the vibrational energy of the crystal is large, the crystal can generate an aerial vibration,
which makes a sound. Piezoelectric buzzers use this principle.
Microcomputer and piezoelectric buzzer
Principle of piezoelectric device
Contraction
Figure 4.3 Principle of piezoelectric device
Figure 4.4 Buzzer using a piezoelectric device
++++++++++++++++
++++++++++++++++
---------------------------
---------------------------
Vibration
++++++++++
++++++++++
------------------
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Expansion
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56
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Pulse input
© Fujitsu
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